前言火力发电厂水冷壁管加焊鳍片,目的是组成气密性炉膛,防止火焰及腐蚀性气体对炉墙的侵蚀及引起炉内结焦。运行中,管材与鳍焊处由于热胀差可能造成裂纹,裂纹的延伸将导致爆管。能否在裂纹形成而未达爆管前,趁停炉检修的时间用无损检验的;法发现出裂纹并及时进行处理,以保证运行的安全呢?采用脉冲反射式超声波探伤仪,配合适当的探头就可以达到上述的目的. Preface Thermal power plant water wall tube welding fin, the purpose is to form airtight furnace, to prevent the flame and corrosive gases on the furnace wall erosion and cause the furnace coke. In operation, pipe and fin welds may cause cracks due to differential thermal expansion, and the extension of cracks will result in squibs. Whether the formation of cracks in the burst pipe is not before, taking the time to stop furnace maintenance time with non-destructive testing; method of crack found and promptly processed to ensure the safety of operation? Using pulse reflection ultrasonic flaw detector, with the appropriate The probe can achieve the above purpose.